Office center water supply project

Our design company develops working documentation and stage P section BK B1 of the cold water supply of the cold water supply of the multifunctional office  center.

WATER SUPPLY DESIGN

Information about existing and planned sources of water supply.

The source of the water supply of the complex is the city ring water main, diameter 400 mm, passing along the street. The complex projected building has 2 water inlets with diameter 250 mm with the installation of water meter station behind the first wall of the building.

For more information about the existing and planned sources of water supply, see the design of external water supply networks.

Information about existing and planned protection zones of drinking water supply sources, water protection zones.

Information about protection zones of water supply sources and water protection zones is described in the project of on-site water supply networks.

Description and characteristics of the water supply system and its parameters.

In the building of the residential complex the following cold domestic and drinking water supply systems are provided.

- B0 - the system of general domestic and drinking water supply;

- B1 - system of cold domestic and drinking water supply;

- B11 - irrigation water supply system.

For domestic and firefighting needs of the Hotel and Office Complex, 2 inlets of the general domestic and drinking water supply system (B0) DN 250 are provided.

Behind the first wall of the building there is a water measuring unit, which includes shut-off valves and water measuring insertion. The water-metering insert includes a magnetic-mechanical filter, a water meter with pulse output BMX 80, as well as a drainage device and a manometer.

A check valve is provided after the water meter insert. For the water inlet and the water measuring insert, see the HVAC project.

Before the water measuring unit there are two DN200 branches for firefighting needs. Description of fire suppression and automatic fire suppression system, see "Automatic fire extinguishing system" hereinafter AUTO.

The system of cold domestic and drinking water supply (B1) is provided for domestic and technological needs of the Hotel and Office Complex consumers.   Cold water supply of the hotel part of the complex is separate from other parts of the complex.

The network of internal cold domestic and drinking water supply (B1) is designed as a dead-end. After the entry point, the water is supplied to the pumping stations 1B1 and 2B1.

Pumping station 1B1 supplies water to the drinking water supply network of the office building and the restaurant, as well as for hot water preparation in the buildings. The pumping unit 2B1 supplies water to the domestic and drinking water supply network of the hotel, as well as for the preparation of hot water of the hotel. Justification for the design of pumping systems see paragraph 8.

A watering system (B11) is provided for irrigation of the area adjacent to the building. For watering the area every 60 m along the perimeter of the building there shall be DN25 watering cocks.

The watering cocks are installed in niches on the outer wall of the building. On the general branch to the watering cocks there is a water measuring unit, on each branch to the watering tap there is a shut-off valve and a drain valve to remove water from the watering tap in winter.

There are shut-off valves on the drinking water supply network

- on the branch to risers;

- on the branch to the groups of sanitary devices of the hotel rooms;

- at the branch to the sanitary appliance groups of non-residential premises.

At the base of the riser pipes of the cold water supply networks there is a water drain. If the pressure at the branch to the sanitary appliances or sanitary technical units is more than 45 meters of water column, the installation of pressure regulators is provided.

All shutoff and other valves (control valves, etc.) are designed for a pressure of at least 1.6 MPa.

According to the technical specifications, the distribution of the cold domestic and drinking water supply networks in the living quarters of the hotel, offices, as well as the restaurant premises is carried out to the branch to the consumers with the installation of shut-off valves and water measuring insert.

Main networks B1 perform: openly - under the ceiling and walls of the parking and other technical facilities, hidden - in fines, in the space podshivnoy ceiling of the premises of public use or rooms that have high demands for decoration. 

The risers shall be laid in communication shafts. Placement of shut-off valves, as well as placement of equipment (strainers, water meters, etc.) on the branches to consumers are provided in communication shafts, in technical rooms or in sanitary rooms.

To stop valves and equipment shall be provided access for periodic maintenance and replacement.

Information about the estimated (design) consumption of water for domestic and drinking needs, including automatic firefighting and technical water supply, including recycling.

The design water consumption for the domestic and drinking needs is determined by the method SP 30.13330.2012. Estimated costs for firefighting needs are determined in accordance with the STU. The results of calculations are presented in tables 1, 2, 3. 

Table 2. The main indicators of the water supply systems of the office area 

The required capacity for water heating will be 0.8912 Gcal/h. 

Table 4. The cost of internal firefighting.

Information on the estimated (design) water consumption for production needs - for production facilities.

Since the object is not intended for production purposes, the water consumption for production needs is not provided for it.

Information about the actual and required head in the water supply network, design solutions and engineering equipment to create the required water head.

According to the technical conditions for the connection of hotel and office complex to the water supply and sanitation systems, issued by JSC "MOSVODOKANAL", the maximum head in the connection point is 49 meters, and the minimum 44 meters.

The required head in meters of water column for the cold water supply network B1 of the office building (building "A") and the restaurant:

Where: Hgeom - geometric elevation, defined as the difference between the installation elevation of the highest located instrument and the ground elevation at the point of connection of the water supply inlet to the city network;

170 m - absolute installation elevation of the highest located device;

120 m - absolute ground elevation at the point of connection of the input to the urban water supply network;

Npc. - free head at the sanitary unit. Hppr.=20 m;

Δh0cch. - head loss (m) in the water meter of diameter 80 at the inlet to the building. Δhcch=0.31 m, see p.13;

ΔhB0 network - head losses at the building inlet. ΔhB0 network = 0.4 m;

ΔhB1 network - head loss in the network B1 from the inlet to the furthest and highest located device. ΔhB1net = 10 m.

ΔhB1m.s - head losses at local resistances. 20 % along the length of the network. ΔhB1m.s = 2 m.

ΔhB1c. is the head loss in the supply meter, which is installed in the calculated section of the hydraulic calculation of the network B1 of the office building and the restaurant. In this case it is the flow meter at the office building branch - ΔhB1count.=2.88 m.

Meter selection see point 13.

ΔhB1count.1 - loss on a 50 mm flowmeter at the branch to the B1 network of the office building and the restaurant. ΔhB1count.1 = 0.75 m.

The required head for the cold domestic and drinking water supply network B1 of the office building and the restaurant is equal: The required head in the hot water supply network T3 of the office building and the restaurant is the same as the required head in network B1, because the losses in the hot water preparation equipment are compensated by the circulation and booster pump. For more details on the scheme of hot water preparation, see the DHW design.

The pump unit is selected for the required head of the cold water supply network.

The required head of the pump unit (m): Where: Net - the guaranteed head in the network of on-site domestic and drinking water supply. Hseti min. = 44м Q us = 39,8 m3/h = 11,1 l/sec.

Let's accept the pump installation with 3 pumps (two working, one standby).  We select the pump installation by Grundfos (Denmark) Hydro MPC- E 3 CRE 15-3.  The characteristics of one pump Q=19.9 m3/h, H=43.3 m, P2=4.0 kW.  All pumps of this unit are equipped with frequency controllers. The pump unit is equipped with a 25l hydro-pneumatic tank for smoothing hydraulic shocks. The pump unit is installed in the room of the water measuring unit.

The required head in meters of water column for the cold water supply network B1 hotel:

Hheom - geometric height of elevation, defined as the difference between the installation elevation of the highest hotel appliance and the ground elevation at the point of connection of the water supply inlet to the city network; The required head in the hotel hot water supply network is similar to the required head in network B1, since losses in the hot water preparation equipment are compensated by the circulation and booster pump. For more details on the scheme of hot water preparation, see the DHW design.

The pump unit is selected for the required head of the cold water supply network. The required head of the pump unit (m): Where: Net - the guaranteed head in the network of on-site domestic and drinking water supply. Hseti min. = 44м

We accept a pump unit with 3 pumps (two working, one standby. We select the pump installation by Grundfos (Denmark) Hydro MPC- E 3 CRE 3-4. The characteristics of one pump Q=2.7 m3/h, H=16.8 m, P2=0.55 kW. All pumps of this unit are equipped with frequency controllers. The pump unit is equipped with a 25l hydro-pneumatic tank for smoothing hydraulic shocks. The pump unit shall be installed in the water meter room.

Information about materials of water supply system pipes and measures to protect them from aggressive effects of soil and groundwater.

The drinking water supply network, except for the distribution within the sanitary facilities and the supply pipes to the technological equipment, shall be made of galvanized steel water and gas pipes GOST 3262-75 and galvanized steel longitudinal welded pipes GOST 10704-91. 

The distribution of domestic and drinking water supply network B1, within the sanitary rooms and supply to the technological equipment, perform in the floor PE-Xa pipes. Thermal insulation is provided to prevent condensation on the pipes of the cold potable water supply network B1. Minimum thickness of thermal insulation 13 mm.

The insulation material used is K-flex foam rubber insulation. The materials of the pipelines for the hot water system (supply and circulation) are provided similarly to the system of cold potable water B1.

To reduce heat losses during transportation of hot water to consumers, the network of hot (T3) and circulation (T4) water pipes is thermally insulated. The minimum thickness of K-flex type thermal insulation is 13 mm. When laying water supply networks within the parking area, non-combustible insulation by Rockwool shall be provided. Materials of pipes and measures for protection of pipelines of external water supply networks from ground water see project "External water supply networks".

Information about water quality.

Water supplied to the building from the municipal water supply system conforms to the norms of SanPin 2.1.4.1074-01.

List of measures to ensure the established indicators of water quality for various consumers.

Water , incoming coming to the building of the hotel and office complex with underground parking for household needs , meets the standards of SanPin 2.1.4.1074-01. No additional measures to ensure the established water quality indicators are required.  Since the hotel has a category ***, no additional facilities to improve water quality are required.

 List of water redundancy measures.

The Hotel and Office Complex building has two water inlets from ring  citywide city ring which will provide the building with water for all needs, such as: household, potable, technological, irrigation, firefighting, etc.  Other measures for water reservation are not required.

 The list of measures to account water consumption.

Water meters with a pulse output are used as water consumption meters.  The main water-metering unit is equipped at the inlet to the building in the water-metering unit room.  Water meters are provided on the following branches:

- on the branch to the B1 network of the office part of the building and the restaurant;

- on the branch to the B1 network of the hotel part of the building;

- on the hot water preparation branch for the office part of the building and the restaurant;

- on the branch for hot water preparation of the hotel part of the building; on the branch for hot water preparation of the office part of the building and the restaurant;

- on the B1, T3, T4 branches of the building's restaurant;

- on branches B1, T3, T4 to the catering facility serving the hotel restaurant in building "B" and the canteen of the office center in the building;

- on branches B1 and T3 to the hotel room appliances;

- on branch lines B1 and T3 to the prospective sanitary facilities of the office center (to be installed during the fit&out phase);

- on the branch to the irrigation water supply;

- branch to feed of the refrigeration system;

- on the water supply branch to the humidification system.

We select meters according to the procedure of SNiP 2.04.01-85*. The meter is selected on the basis of hourly water flow rate and checked for passing the second flow rate. Losses in the turbine type water meter should not exceed 2.5 m. Losses in a water meter of the impeller type shall not exceed 5 m.

The main meter on the WO :

Maximum hourly flow rate for the whole building qB0 mahh =43, 4 m3/h.  We select a meter with a nominal diameter of 80.  We check the selected meter for passing the second flow rate.  Where: S - hydraulic resistance of the meter (m/(m3/h)2); S=1,1*10-4 m/( m3/h)2;

q - total second water flow rate for the whole building (l/s). q=qB0= 14,8 l/s.  As a meter we use a water meter VMH И- 80 of the Moscow plant "Vodopribor".  The meter on the branch B1 to the office part and restaurant restaurants :  Maximum hourly flow rate В1  q В1 mach. hour = 24,3 m3/h.  Let us select a meter of nominal diameter 50.  Check the selected meter for passing the second flow rate.

Where: S - hydraulic resistance of the meter (m/(m3/h)2); S=8,2*10-4 m/( m3/h)2;  q - flow rate per second В1 for office part of the complex and restaurants   (l/s).  q=qB1=8,4 l/s.  We use a turbine water meter BMX as a meter И -50 of Moscow factory "Vodopribor".

The meter for preparation of hot water of the office part and the restaurant :  Maximum hourly flow rate Т3  q Т3 mach hour = 14,9 m3/h.  Let's choose the counter of nominal diameter 50 .  Check the selected meter for passing the second flow rate.

Where: S - hydraulic resistance of the meter (m/(m3/h)2); S=8,2*10-4 m/(m3/h)2;  q - second flow hot for office part of the complex and restaurants  (l/s). q=q Т3 = 5,4 l/s.  As a meter we accept turbine water meter BMH И -50 of Moscow factory "Vodopribor".

The meter for preparation of hot water of the hotel :

Maximum hourly flow rate Т3  q Т3 mach hour = 3,84 m3/h.  Let's choose the counter with diameter of nominal bore 32 .  Check the selected meter for passing the second flow rate.  Where: S - hydraulic resistance of the meter (m/(m3/h)2); S=0,069 m/( m3/h)2; q - total second flow rate hot for hotel   (l/s). q=q Т3 = 1,8 l/s.

As the meter we accept a vane   water meter SKBI - 32 Moscow plant "Vodopribor".  The meter on the B1 branch to the hotel room :  We select the counter with the diameter of nominal bore 15.  Check the selected meter for passing the second flow rate.

Where: S - hydraulic resistance of the meter (m/(m3/h)2); S=0,89 m/(m3/h)2;  q - second flow rate В1 of water for hotel rooms   (l/s). q=qB1=0, 42 l/s.

Meter on the branch B1 of the building's restaurant .

The maximum hourly flow for cold water supply of catering enterprises building "C" qB1 maxhour = 5,05 m3/h.  We select the meter with diameter of nominal bore 32 mm. Check the selected meter for passing the second flow rate.

Where: S - hydraulic resistance of the meter (m/( m3/h)2); S=0,069 m/( m3/h)2;  q - second flowrate for cold water supply restaurant (l/s). q=qB1= 2,1 l/s.  As a meter we use turbine water meter SKB И - 32  Moscow factory "Vodopribor".

Meter on the T3 branch of the building's restaurant .

The maximum hourly flow rate for hot water supply for public catering q Т3 makhhour = 3,1 m3/h.  Let's choose the counter of nominal diameter 25 mm.  Check the selected meter for passing the second flow rate.

Maximum second flow rate of one watering tap is q=0,3 l/sec. We assume simultaneous operation of 2 watering cocks, then q=0,6l/s.  We select the counter with nominal diameter of 20 mm.   Let us check the selected counter for passing the second flow rate.

Where: S - hydraulic resistance of the meter (m/(m3/h)2); S=0,3872 m/(m3/h)2;  q - flow per second for for irrigation needs of the complex (l/s). q=qB1=0.6 l/s.  The building of the complex also contains tenant's water supply meters, installed on the networks of cold and hot domestic water supply in the territory of the tenants.

Description of the automation system of the water supply.

The water supply system is subject to automation: a pumping unit with frequency converters and water meters equipped with a pulse output to transmit information about the flow to the central dispatcher's office.

List of measures for rational use of water and its saving.

Equipment and materials used in the project provide full tightness of water supply systems.  The use of automatic booster pump installations with frequency regulation. .

To reduce the irrational use of water, the installation of pressure regulators for hot and cold water in the branches to tenants and apartments,  where the free head is more than 45 meters of water column.

Description of the hot water system.

The hot water system is provided for domestic and technological needs of consumers of the Hotel and Office Complex with underground parking .

The hot water supply of the hotel part of the complex is separate from other parts of the complex.  To reduce the unproductive consumption of hot water, a circulating hot water supply network (T4) is provided. The pipelines to the devices with a length of up to 5 meters are provided as a dead-end.

To cover the difference in pressure in the networks T3 and B1 provides circulation о a circulating booster pump is provided to cover the differential pressure in the T3 and T1 networks.  On the branch line  к riser standpipes on the network T4 to provide the installation of manual balancing valves.

The diameters of the hot water circulation main (T4) are taken two sizes smaller than the diameters of the hot water supply main (T3). To reduce the power consumption of the circulation and booster pump in circulation mode, it is equipped with frequency control. The selection, installation and piping of these pumps is provided in the project "WV".

Hot water preparation is provided for different parts of the building in the IHP. Technology of hot water preparation, see the project "EIA".

The hot water supply to the sanitary units located near the security guards' rooms is to be provided from local electric tank water heaters.

In the shower rooms, as well as in the hotel bathrooms, the installation of water heated towel rails shall be provided.  The wiring of systems T3 and T4 shall be similar to that of the B1 drinking water supply system.  In the upper points of the system T3 and T4 to provide for the release of air by means of automatic air vents.  Material of pipes, type, thickness of insulation see clause 9.

Estimated consumption of hot water.

See item 6 for calculated hot water flow rates.

• Description of water recycling system and measures to ensure reuse of heated water.

Water recycling system in the proposed hotel and office building hotel and office complex  is not provided.  Balance of water consumption and water removal for the object of capital construction in general and for the main production processes - for production facilities.  The projected facility is not an industrial building.

Balance of water consumption and water discharge for the object of capital construction - for non-production facilities. See Appendix 1 for the water consumption balance of the residential building.

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